Energy Converter
Type any value — all units update instantly
What is energy conversion?
Energy units measure the capacity to do work. Joules are the SI standard. Kilocalories are used for food. Kilowatt-hours are used for electricity bills. BTUs are used for heating and cooling systems.
Formula used
Base unit: Joule (J)
1 kJ = 1,000 J
1 kcal (food Cal) = 4,184 J
1 kWh = 3,600,000 J
1 BTU = 1,055.06 J
How to use this calculator
- Type any value into any field
- All other units update instantly
Example
Everyday energy reference:
| Activity / item | Energy | kWh |
|---|---|---|
| 1 food calorie (kcal) | 4,184 J | 0.00116 |
| Running for 30 mins (~300 kcal) | 1,255 kJ | 0.35 |
| AC (1.5 ton) for 1 hour | 5,400 kJ | 1.5 |
| Charging a phone fully | ~15 kJ | 0.004 |
Frequently asked questions
In nutrition, 'Calorie' (capital C) = kilocalorie = 4,184 J. The small calorie (lowercase c) = 4.184 J and is used in chemistry. Food labels always use kcal.
Multiply kWh by your electricity rate per unit. 200 kWh at ₹6.50/unit = ₹1,300.
1 ton AC = 12,000 BTU/hour cooling. 1.5 ton = 18,000 BTU/hour = 5.275 kW. Higher BTU = more cooling power.